EP1419222B1 - Method and system for gasifying biomass - Google Patents
Method and system for gasifying biomass Download PDFInfo
- Publication number
- EP1419222B1 EP1419222B1 EP02753296A EP02753296A EP1419222B1 EP 1419222 B1 EP1419222 B1 EP 1419222B1 EP 02753296 A EP02753296 A EP 02753296A EP 02753296 A EP02753296 A EP 02753296A EP 1419222 B1 EP1419222 B1 EP 1419222B1
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- EP
- European Patent Office
- Prior art keywords
- oil
- tar
- gas
- synthesis gas
- biomass
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/16—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids
- C10K1/18—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids hydrocarbon oils
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/145—Feedstock the feedstock being materials of biological origin
Definitions
- the present invention relates to a method for gasifying biomass, comprising the steps of introducing said biomass into a reactor and subjecting it to temperatures of between 600 - 1300°C, with substoichiometric quantities of oxygen being supplied, subjecting the synthesis gas obtained to a cleaning step in order to remove the grades of tar which are present from it, and feeding the synthesis gas to a consumer.
- biomass is understood as meaning cultivated plants, biomass residue streams, such as prunings, trimmings and waste from parks and public gardens, and waste such as wood from demolition work and the unseparated biodegradable fraction of domestic refuse and industrial waste.
- Gasification of biomass has to be distinguished from pyrolysis of biomass. Pyrolysis differs from gasification in that in pyrolysis no oxygen whatsoever is supplied and the process takes place at a lower temperature (400-700°C). In both processes, gas (synthesis gas, syngas or fuel gas) and char are formed. The gas contains components which are substantially liquid at room temperature, known as tars. In the case of pyrolysis, there is a significant percentage of tars (approximately 65% by weight based on the feed) for which particular processes have been developed in order to substantially separate this large quantity of liquid tar as product oil from the product gas. US Patent 4,206,186 relates to the pyrolysis of a waste stream. In this pyrolysis described, oxygen or oxygen-containing compounds is/are supplied and there is generally less than 10% by weight of tar present.
- the pyrolysis gas is in this case treated with a purge oil and then cooled to above the dew point of water. Adsorption or absorption then takes place with the aid of dry mass. As a result, harmful inorganic substances are removed and then the water is condensed out. The water which is condensed out then has to be subjected to a thorough cleaning step in order for residual tar and other oil-like components to be removed. This requires filtration through activated carbon.
- tars are present, they cause problems since, during cooling, they condense and form aerosols. Lowering the temperature is necessary, for example, in conjunction with a downstream water scrubbing step and also in order to achieve the highest possible efficiency in subsequent use of the gas in a motor. Condensation of tar and deposition of tar aerosols in, for example, downstream motors or on turbine blades or vanes of downstream gas turbines leads to blockage and damage. It is possible to remove a significant proportion of the tars by tar condensation in the water scrubbing step but this results in contamination of the water, the water-soluble tars (and specifically phenol) in particular causing problems, since they are difficult to remove from the water. The removal of tar aerosols in the water scrubbing step is very limited, and these aerosols continue to cause problems for the application of the gas.
- the aim of removing tar from the synthesis gas obtained during the gasification is realised that the cleaning of synthesis gases comprising saturation thereof with an oil which is supplied separately, condensation of the said oil together with a fraction of the tar and passing the gas through an absorption device while further oil is being added to the gas, in order for the tar to be absorbed, discharging the cleaned gas, separating the tar from the oil.
- the complete saturation or supersaturation of the gas with the oil which is supplied makes it possible to ensure that all the essential organic impurities are removed from the gas.
- Condensation of the oil and tar takes place in a separate step upstream of the absorption device, but may also take place partially in the absorption device. A combination is also possible. Saturation preferably takes place under atmospheric conditions. In the present context, the term substantially atmospheric conditions is understood as meaning a pressure which lies in the range between 0.8-2 bar.
- gas will be supplied to the scrubbing system, comprising a saturation, condensation and absorption device, at a relatively high temperature, such as approximately 500°C. Since the gas is at a higher temperature (700-1000°C) when it leaves the gasification device, the heat which is released during the temperature drop can be used to heat the scrubbing system. It is also possible to include a separate intermediate cooling step, in which the high-quality heat obtained in this way can be used to good effect. It is important for the temperature in the scrubbing system to remain significantly above the dew point of the water which is/may be present in the synthesis gas, for example between 70 and 100°C.
- the dew point is approximately 60°C, i.e. according to the present invention carrying out the supersaturation step at a temperature of below 120°C ensures that all the organic components are absorbed, so that the water obtained no longer contains these components. It is not desirable for water to be separated out in the scrubbing step according to the invention. This preferably takes place in a downstream step. In a subsequent step of this type, for example, by means of a downstream water scrubbing step, in which the temperature is reduced further and water condenses, by way of example ammonia and hydrochloric acid can be removed. An ammonium salt, for example, ammonium sulphate, can be prepared from ammonia.
- Ammonium can be separated out of the synthesis gas and used to produce ammonium sulphate used in the chemical industry, textile industry, gas industry and for the production of fertilizer. Since with the abovementioned method tar has already been removed from the synthesis gas, the ammonium salt obtained is relatively pure. After removal, a simple crystallization step is sufficient to obtain further products for the chemical industry. The separation of tar from the ammonium salt obtained in this way is not necessary, unlike in processes which are known from the prior art and in which ammonia is removed from synthesis gas.
- the method described above can be repeated a number of times in succession, either at the same temperature or at different temperatures.
- At least a fraction of the oil which is used in the scrubbing/saturation process described above is fed to the reactor and participates in the gasification.
- the tar-laden oil is subjected to a separation step for the separation of tar/oil, the tar which is released in this step being fed to the reactor for gasification of the said biomass, and the oil obtained being at least partially returned to the saturation step, condenser or absorption step.
- the tar which is returned may comprise approximately 50% of oil.
- the gas can be subjected to a water removal step, for example by condensation.
- a water removal step for example by condensation.
- a further oil-saturation step the temperature of which is significantly lower, since there is no longer a risk of water condensing out, to be connected downstream.
- this step it is also possible to remove substances such as benzene, toluene and xylene.
- venturi device By using a venturi device, it is possible to provide for optimum supersaturation and condensation of the synthesis gas with oil. Downstream of the venturi, it is possible to collect condensing oil and tar upstream of the absorption device and to process them further as described or to simply remove this oil in the absorption step.
- the oil which is used in the method may be any mineral or vegetable oil which is known in the prior art. It is preferable to use a nonvolatile oil, and more particularly an oil in which the molecules comprise approximately 15 - 50 carbon atoms.
- nonvolatile is understood as meaning an oil grade which, at a temperature between 70 and 100°C, releases less than 10 mg of oil per standard cubic metre of cleaned synthesis gas.
- the tar which is separated out is preferably used as oil for the saturation and condensation process described above.
- the present invention is preferably carried out under substantially atmospheric conditions, unlike in processes such as the cleaning step after coal and mineral oil residue gasification, which uses elevated temperatures of 1200-1500°C and a pressure of approximately 10-40 bar, so that relatively light oil is used.
- processes of this type the formation of phenol is in principle unlikely, and therefore no special measures have to be taken as in the absorption device which is used according to the invention.
- the temperature of the gas during condensation of the said oil is higher than the dew point of any water present under the corresponding conditions, i.e. higher than 70-100°C.
- the method described above results in cleaned synthesis gas being formed.
- This gas predominantly comprises carbon monoxide, hydrogen and carbon dioxide.
- non-condensable hydrocarbons such as CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 6 and C 3 H 8 , as well as the hydrocarbons with a higher molecular weight, and inert components, such as nitrogen, argon and helium, may be present.
- the composition and concentrations are dependent on the biomass used.
- further separation of the gas obtained in this way takes place in order to isolate some of the gases described above.
- One separation method is cooling, for example, cooling to -200°C.
- gases/gas mixtures which are utilized further, for example substituted for natural gas, fuel for generating electricity (in fuel cells), as raw materials for further chemical reactions, etc.
- a separation of this type may be carried out in stages. For example, in a first stage carbon dioxide can be separated out and, in a subsequent separation stage, the hydrocarbon-containing components can be separated from the other substances mentioned.
- This separation is not restricted to combination with the special gasification described above, but rather can be used in combination with any type of gasification and/or pyrolysis of biomass. This means that gas which is released during pyrolysis or gasification of biomass can be subjected to the separation treatment described above, and the product thus obtained can be used either as fuel or in the chemical industry.
- composition of these gases is dependent not only on the biomass supplied but also on the conditions under which the gasification according to the present invention is carried out. This relates to both the temperature and the quantity of oxygen.
- the light tar grades are organic compounds, such as phenol, benzene, toluene, xylene and naphthalene. These too can be usefully exploited, either in combination or as separate streams. These substances can also be used as basic chemicals in the chemical industry. They can also be used as solvents.
- the heavy tar grades which are formed in the method described above contain organic compounds with a relatively high boiling point, such as anthracenes, fluoranthene and phenanthrene. These heavy tar grades can either be discharged directly for further use or may first be separated. Possible fractions are carbolineum, creosote oil, pitch, light anthracene oil and heavy anthracene oil. Substances of this type can also be used in the paint, coatings, lubricant industries, for concrete preparation, in medicaments and in the paper industry. Light tar grades which are formed in the process described above can likewise be exploited usefully in the chemical industry and are suitable for the production of fuels.
- 1 denotes a gasifier. Feed for a material which is to be gasified to the gasifier is denoted by 2. The feed of gasification medium with oxygen or oxygen-containing compounds to the gasifier 1 is denoted by 7. The discharge of synthesis gas is denoted by 3. This synthesis gas is initially passed into a cyclone 4, where solid particles are separated out and discharged via line 5.
- the synthesis gas which comes out of the cyclone is passed through a saturation device.
- Saturation with oil has to be carried out at a relatively high temperature, since according to the invention the oil is supplied in liquid form and has to be evaporated.
- a temperature of 280°C is mentioned by way of example. If appropriate, a cooler may be connected upstream of the saturation device. This is described in more detail with reference to Fig. 3.
- saturation device 8 the synthesis gas is saturated with possibly hot oil by sprinkling. Oil comes out of line 39. There is a venturi in condensation device 9. Close to the location with the highest gas velocity, cold oil is injected via line 38, so that the gas is supersaturated, the oil and the tar condense and form droplets which grow as a result of the supersaturation and the reduction in the temperature. In the process, the aerosols are also removed as a result of them accumulating to form larger drops.
- the oil saturated synthesis gas together with the oil/tar drops then flows through line 10 to a gas/liquid separator 11.
- Oil/tar liquid which is released in the process passes via line 12 to a separation device 13. Separation is carried out in this separation device on the basis of gravity.
- the heavier fraction, which contains more tar, is discharged to line 25. This fraction may be passed completely or partially to the gasifier.
- a separation device in line 25, by means of which oil and tar/oil products are separated.
- the oil can be introduced back into the process, i.e. is not fed to the inlet of the gasifier 1.
- the tar/oil products may either be fed to the gasifier 1 or be utilized in industry.
- this step of separating oil and tar can be used for any oil/tar mixture which is formed in gasification or pyrolysis and in which tar which is formed is utilized further, for example, in the chemical industry.
- the synthesis gas is fed to absorption device 15 via line 14. Also, in the process, any aerosols which are present are removed. Oil is fed into this absorption column 15 via line 16 and/or 17 at a temperature of preferably 70 to 100°C.
- the scrubbing oil moves from the top downward through the absorption device. As a result, the synthesis gas is brought into contact, in countercurrent, with the scrubbing oil.
- the synthesis gas cools down in the absorption device, so that as well as absorption of gaseous tar compounds (including the water-soluble tars), condensation of tar may also take place.
- the absorption device may be designed as a plate-type scrubbing device or may be provided with packing. In this case the absorption device is designed in such a manner that water just does not condense under the prevailing conditions (pressure, temperature and fraction). Residual tar will dissolve in the oil.
- the mixture of oil and tar grades is discharged via line 18 to a regenerator 19. Possibly preheated air is introduced via inlet 20.
- the absorbed gaseous tars are for the most part separated out and discharged into the air via line 21.
- the contact is preferably effected by sprinkling.
- Line 21 is connected to line 7, i.e. the tar compounds in the released air/tar mixture which are separated out during the regeneration are fed back to the gasification.
- a separation device it is possible for a separation device to be arranged in line 18 in order to separate the oil and oil/tar product and possibly to separate out specific tar components or groups of components.
- tar/oil mixtures which come out of line 12 are separated as far as possible and the tar, which may comprise up to 50% of oil is returned via line 25 to the gasifier 1, while oil from which tar has been substantially removed is introduced back into the oil circuit via line 17.
- the synthesis gas from which tar has been removed is fed via line 26 to a water scrubbing stage 27.
- heat exchangers may be connected into lines 3, 5 and 26, in order to reduce the temperature of the synthesis gas, and this heat can be put to good use elsewhere in the process or in some other way.
- heat exchangers may be connected into lines 16 and/or 17, 38 and 39, in order to bring the oil to the desired temperature.
- this temperature is 70-100°C
- line 38 it is 20-100°C
- for line 39 it is, for example, 280°C.
- 28 denotes the line connected to an internal-combustion engine or the like, where the synthesis gas is utilized.
- Fig. 2 shows, as an example, the further path of the process described above. 27 corresponds to block 27 in Fig. 1, i.e.
- Cooling may take place in various stages. During a first stage, CO 2 can be removed (solidification point -78°C). During a subsequent stage, most of the hydrocarbon compounds can be separated out. If cooling takes place as far as -161°C, a mixture similar to LNG is formed, and the residual gas is syngas, i.e. a mixture of H 2 and CO.
- cooling can take place (in stages) to -104°C, during which stage C 2 H 4 and C 2 H 2 are obtained, and these compounds can be used in the chemical industry.
- the residual gas formed in this case consists of the syngas referred to above and specific hydrocarbon compounds, such as methane. These can be used to supply energy.
- components such as NH 3 and CO 2 can be discharged together and/or separately.
- Fig. 3 diagrammatically depicts the precooling of the synthesis gas and the saturation (cf. S in Fig. 1). Cooling of the synthesis gas from the gasifier takes place both during the precooling and during the saturation.
- the precooler is denoted by 35, while in this specific example, the saturation device is denoted by 36.
- the precooler may comprise a heat exchanger with separate media, i.e. there is no direct contact between the gas and the circulating medium, which is denoted by 37. This circulating medium 37 exchanges heat with a further exchanger, which is denoted by 40 and which is used to generate supersaturated steam 41. To avoid precipitation on the heat exchanger walls, the temperature drop in heat exchanger 35 is limited to 350°C.
- this step of at least two-stage cooling of gas which is obtained can also be used in other processes, for example in other gasification of biomass and/or pyrolysis thereof.
- the above-described way of cleaning gases can also be used in other gases with organic impurities (coke gas, industrial gas and gasses which are released in the chipboard industry).
Abstract
Description
Claims (21)
- Method for gasifying a biomass, comprising the steps of introducing this biomass into a reactor and subjecting it to temperatures of between 600 - 1300°C, with substoichiometric quantities of oxygen being supplied, subjecting the synthesis gas obtained in this way to a cleaning step in order to remove the grades of tar which are present from it, and feeding the synthesis gas to a consumer, characterized in that the cleaning of synthesis gases comprises the steps of completely saturating them or super saturating them with an oil which is supplied separately, condensing this oil with a fraction of the tar and passing the gas through a tar absorption device while further oil is being added to the gas in order to absorb the tar, discharging the cleaned gas and separating at least a fraction of the tar out of this oil.
- Method according to Claim 1, in which at least a fraction of the tar is fed to the reactor in order to be introduced into the gasification process.
- Method according to one of the preceding claims, in which the tar-laden oil is at least in part subjected to a separation step for separating tar/oil, during which the tar which is released is fed to the reactor for gasification of the said biomass, and the oil obtained is at least partially returned to the saturation step, condensation or absorption step.
- Method according to Claim 3, in which the tar which is released is at least in part fed to the reactor for gasification of the biomass.
- Method according to Claim 3 or 4, in which the tar which is released is at least in part discharged and subjected to a further separation step.
- Method according to one of the preceding claims, in which the said gas is subjected to a water-removal step after it has been saturated with oil.
- Method according to Claim 6, in which the said gas, after the water-removal step, is subjected to a further cleaning step by being saturated with oil at a temperature of less than 50°C.
- Method according to one of the preceding claims 3-7, in which the said oil, together with the tars which are still present, is subject to a separation step which involves subjecting it to a gasification medium or an inert gas and feeding the gas which escapes, together with the tar which is released, to the reactor for gasification of the said biomass.
- Method according to one of the preceding claims, in which the cleaned synthesis gas is passed through a water scrubbing device.
- Method according to one of the preceding claims, in which ammonium is removed from the synthesis gas as ammonium salt, the said salt immediately being subjected to a crystallization step.
- Method according to one of the preceding claims, in which the synthesis gas is subjected to a mass-based separation before it is cleaned.
- Method according to one of the preceding claims, in which the said oil comprises an oil whose molecules comprise on average 15-50 carbon atoms.
- Method according to one of the claims, in which the temperature of the gas during condensation of the oil is higher than the dew point of water under these conditions.
- Method according to one of the preceding claims, in which the synthesis gas is subjected to a separation treatment in order to obtain fuels.
- Method according to one of the preceding claims, in which the synthesis gas obtained is subjected to a separation treatment in order to obtain raw materials for the chemical industry.
- Method according to one of Claims 14 or 15, in which the said separation step comprises cooling.
- System for gasifying a biomass, comprising a reactor for gasifying the biomass at 600 -1300°C, provided with a feed for biomass and gasification medium and a discharge for synthesis gas, a cleaning device for removing tar from the synthesis gas, characterized in that the said cleaning device comprises a saturation device for completely saturating or super saturating the said synthesis gas with oil, and a downstream condensation device and a downstream tar absorption device provided with means for bringing the said synthesis gas into contact with oil, the said cleaning device comprising a low-level inlet for gas and a high-level outlet for gas, and a discharge for tar-laden oil.
- System according to Claim 16 or 17, comprising a separation device for separating tar-laden oil into oil and tar, the said separation device being provided with an inlet, which is connected to the said discharge of the said saturation device, condensation device and/or absorption device, an outlet for tar connected to the said reactor and an outlet for oil connected to the said feed for oil of the said saturation device, condensation device and/or absorption device.
- System according to one of Claims 12-18, comprising a centrifugal separation device which is connected upstream of the saturation device.
- System according to one of Claims 12-19, comprising a dust filter which is connected upstream of the saturation device.
- System according to one of Claims 12-20, comprising a gas cooler which is connected upstream of the saturation device.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1018803A NL1018803C2 (en) | 2001-08-22 | 2001-08-22 | Method and system for gasifying a biomass. |
NL1018803 | 2001-08-22 | ||
PCT/NL2002/000557 WO2003018723A1 (en) | 2001-08-22 | 2002-08-22 | Method and system for gasifying biomass |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1419222A1 EP1419222A1 (en) | 2004-05-19 |
EP1419222B1 true EP1419222B1 (en) | 2005-11-30 |
Family
ID=19773904
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02753296A Expired - Lifetime EP1419222B1 (en) | 2001-08-22 | 2002-08-22 | Method and system for gasifying biomass |
Country Status (10)
Country | Link |
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US (1) | US7803845B2 (en) |
EP (1) | EP1419222B1 (en) |
JP (1) | JP5241990B2 (en) |
AT (1) | ATE311427T1 (en) |
CA (1) | CA2458365C (en) |
DE (1) | DE60207735T2 (en) |
DK (1) | DK1419222T3 (en) |
ES (1) | ES2254711T3 (en) |
NL (1) | NL1018803C2 (en) |
WO (1) | WO2003018723A1 (en) |
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FR2804043B1 (en) | 2000-01-21 | 2002-08-02 | Thide Environnement | PROCESS AND PLANT FOR PURIFYING GAS FROM WASTE THERMOLYSIS |
KR100590973B1 (en) * | 2000-02-29 | 2006-06-19 | 미츠비시 쥬고교 가부시키가이샤 | Apparatus for methanol synthesis using gas produced by gasifying biomass and the using method thereof |
US20040265158A1 (en) * | 2003-06-30 | 2004-12-30 | Boyapati Krishna Rao | Co-producing hydrogen and power by biomass gasification |
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2001
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9005319B2 (en) | 2011-06-10 | 2015-04-14 | General Electric Company | Tar removal for biomass gasification systems |
Also Published As
Publication number | Publication date |
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EP1419222A1 (en) | 2004-05-19 |
DK1419222T3 (en) | 2006-03-27 |
US7803845B2 (en) | 2010-09-28 |
JP2005501169A (en) | 2005-01-13 |
ES2254711T3 (en) | 2006-06-16 |
JP5241990B2 (en) | 2013-07-17 |
DE60207735T2 (en) | 2006-08-03 |
US20040220285A1 (en) | 2004-11-04 |
NL1018803C2 (en) | 2003-02-25 |
CA2458365A1 (en) | 2003-03-06 |
DE60207735D1 (en) | 2006-01-05 |
ATE311427T1 (en) | 2005-12-15 |
WO2003018723A1 (en) | 2003-03-06 |
CA2458365C (en) | 2012-02-07 |
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